improve readme and clean code

README.md

@@ -28,4 +28,13 @@ import { on } from 'jetemit';
 on('TIME', time => {
   console.log(time);
 });
+```
+
+unsubscribe lisener
+```javascript
+const unsubscribe = on('TIME', time => {
+  console.log(time);
+});
+
+unsubscribe();
 ```

index.js

@@ -3,20 +3,19 @@
 exports.__esModule = true;
 var subscribes = {};
 
-var on = exports.on = function on(name, func) {
+exports.on = function on(name, func) {
   subscribes[name] = subscribes[name] || [];
   var index = subscribes[name].push(func) - 1;
   return function () {
     subscribes[name][index] = undefined;
   };
 };
 
-var emit = exports.emit = function emit(name, arg) {
+exports.emit = function emit(name, arg) {
   if (subscribes[name]) {
     subscribes[name].forEach(function (func) {
       func && func(arg);
     });
   }
 };
 
-

package.json

@@ -1,6 +1,6 @@
 {
   "name": "jetemit",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "",
   "main": "index.js",
   "scripts": {